Vibrorheological model of the vibrofluidized bed of dry substances

Autor: G. V. Nikitenko, K. V. Lunyaka, S. A. Rusanov
Rok vydání: 2012
Předmět:
Zdroj: Journal of Engineering Physics and Thermophysics. 85:1284-1289
ISSN: 1573-871X
1062-0125
Popis: Introduction. Methods of vibrational intensification of physical processes and chemical reactions find expanding applications in many industries. The intensification of the above processes implies both their acceleration and a fuller use of interacting substances. The rational choice of equipment and technology considerably upgrades the quality of products and decreases the labor intensity of their manufacture and cost. In specific cases, the use of vibration permits creating new technological processes which without vibration are either unrealizable or unprofitable. These processes are intensified with the help of various vibration machines and apparatuses, using simultaneously two or more technological operations. Of these apparatuses, the most important ones are apparatuses with a vibrofluidized bed of a dry substance in an air or gas medium and apparatuses with vibrational mixing of suspensions, emulsions, and flows of gas bubbles in liquids. The majority of such technologies lead to a considerable acceleration of the processes, an increase in qualitative indices, and a decrease in the size of apparatuses. Description of the Basic Material. The mathematical description of the vibrofluidized bed of a dry substance is based on the known rheological approach [1, 2]: if only the slow (averaged) motions of the bed of the dry substance are considered and the fast (vibrational) motions are neglected, then the motion of the vibrofluidized bed will resemble the viscous fluid flow and can be characterized by the usual rheological constants. According to this concept, the dispersive medium is considered as a pseudohomogeneous layer having effective dynamic properties depending on both the properties of substance components and the parameters of vibrational actions. Instead of the usual adhesion conditions on the surfaces the slippage condition is fulfilled thereby: τ⏐s = τ (v τ) = β l.s v τ , (1)
Databáze: OpenAIRE
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